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Antiferromagnetic excitonic insulator state in Sr3Ir2O7

Author

Listed:
  • D. G. Mazzone

    (Brookhaven National Laboratory
    Paul Scherrer Institut)

  • Y. Shen

    (Brookhaven National Laboratory)

  • H. Suwa

    (The University of Tokyo
    University of Tennessee)

  • G. Fabbris

    (Advanced Photon Source, Argonne National Laboratory)

  • J. Yang

    (University of Tennessee)

  • S.-S. Zhang

    (University of Tennessee)

  • H. Miao

    (Materials Science and Technology Division, Oak Ridge National Laboratory)

  • J. Sears

    (Brookhaven National Laboratory)

  • Ke Jia

    (Chinese Academy of Sciences)

  • Y. G. Shi

    (Chinese Academy of Sciences)

  • M. H. Upton

    (Advanced Photon Source, Argonne National Laboratory)

  • D. M. Casa

    (Advanced Photon Source, Argonne National Laboratory)

  • X. Liu

    (ShanghaiTech University)

  • Jian Liu

    (University of Tennessee)

  • C. D. Batista

    (University of Tennessee
    Quantum Condensed Matter Division and Shull-Wollan Center, Oak Ridge National Laboratory)

  • M. P. M. Dean

    (Brookhaven National Laboratory)

Abstract

Excitonic insulators are usually considered to form via the condensation of a soft charge mode of bound electron-hole pairs. This, however, presumes that the soft exciton is of spin-singlet character. Early theoretical considerations have also predicted a very distinct scenario, in which the condensation of magnetic excitons results in an antiferromagnetic excitonic insulator state. Here we report resonant inelastic x-ray scattering (RIXS) measurements of Sr3Ir2O7. By isolating the longitudinal component of the spectra, we identify a magnetic mode that is well-defined at the magnetic and structural Brillouin zone centers, but which merges with the electronic continuum in between these high symmetry points and which decays upon heating concurrent with a decrease in the material’s resistivity. We show that a bilayer Hubbard model, in which electron-hole pairs are bound by exchange interactions, consistently explains all the electronic and magnetic properties of Sr3Ir2O7 indicating that this material is a realization of the long-predicted antiferromagnetic excitonic insulator phase.

Suggested Citation

  • D. G. Mazzone & Y. Shen & H. Suwa & G. Fabbris & J. Yang & S.-S. Zhang & H. Miao & J. Sears & Ke Jia & Y. G. Shi & M. H. Upton & D. M. Casa & X. Liu & Jian Liu & C. D. Batista & M. P. M. Dean, 2022. "Antiferromagnetic excitonic insulator state in Sr3Ir2O7," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-28207-w
    DOI: 10.1038/s41467-022-28207-w
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    1. Soonmin Kang & Kangwon Kim & Beom Hyun Kim & Jonghyeon Kim & Kyung Ik Sim & Jae-Ung Lee & Sungmin Lee & Kisoo Park & Seokhwan Yun & Taehun Kim & Abhishek Nag & Andrew Walters & Mirian Garcia-Fernandez, 2020. "Coherent many-body exciton in van der Waals antiferromagnet NiPS3," Nature, Nature, vol. 583(7818), pages 785-789, July.
    2. Y. F. Lu & H. Kono & T. I. Larkin & A. W. Rost & T. Takayama & A. V. Boris & B. Keimer & H. Takagi, 2017. "Zero-gap semiconductor to excitonic insulator transition in Ta2NiSe5," Nature Communications, Nature, vol. 8(1), pages 1-7, April.
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